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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '743a5fb76c94176bfb7538f4638ac7174927c558d31b3b8f2980f27c6e49a880' 
  AND token = 'Dfa49vAr9b1GKI2rlZwTPYJNKmqS7nOWcQePEPD0QZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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