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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a55faed31774c91cbbd9b4cf073bfb6b74ffb37bf39b4f402331d435de5dd9e' 
  AND token = '20ZfjP0US1OUvKA9HmyspjmfqYxECQceBBPKNw/4eDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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