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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07b2c8b6387104788356402c4be6e6684725e81066e36b293bdc6618b3afc1a' 
  AND token = 'bhQoGlaRsLsqMTOgab6TifN0SNqpjQXTec6asMHGfvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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