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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47dbd7cd3161ed8aeacb158f550f52d6775cdc4711f0b9095cef6ac2fbd36fb0' 
  AND token = '1UIN4pDSW3VroGQeRsKs979BJyrH3dKZQY4L7a42vCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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