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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c193416d827f0bdd3417dfad6a6a75f8589e43c65f9b53aa09050a941b92fe0b' 
  AND token = 'JvjTB1QMHcg7toU75V4HVQM2PzFSMlgJa404uptAgH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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