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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb7540ae3e8330fc1b11937eed2a2966a8cc7dc17022e9988a79f8efe21439e' 
  AND token = '2btJFQmqJeiNbgCq/bVRswtAZjLuLNBHnn97sPIWgDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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