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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f152ee5ef83bf2aeccba0b2210006787b4151b267e3b202f1d6b76f90e1148f3' 
  AND token = 'o5I9rj1+AAV0yhI2sDvldc8b3qxhqXq76/G3St6BTeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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