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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2937e71c135cacbe274d6678e6c7d860f2fa94e5e6b372fe2b3f0782d9f02bb' 
  AND token = 'qmoVZ23bH9oMkJiqqFGuXnEXVAdEIoSQ7ycZkGVmoBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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