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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4dc94d23fd541c4957674e902d07d75f62c434c7104dbabda4e55cabc5cfd3' 
  AND token = '/6QUw1/VdUrEkWGFecIBoQxEgFcyW043l9hWvWKnmk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}