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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a290351cf5d9e4c2fceaed8d7303c5b0ad64b5c415c1a24633cd0dca377a9f0' 
  AND token = 'ah2E1XDGsGbTkFEHysRExiO1E27hKjE7F9YU+pTj3CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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