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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b369f97fac22202565e543de6d159660d89cc0f056dc9ded1d799e605b657293' 
  AND token = 'cfFZKNOandV6S5k+JXoIiHouLjX3ye4Q7eNsrCiK73o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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