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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb4f6c38c423cdbeb7f4e8c61d8ca7c85ce0ae36f02c0e0cc5cf29d52f1e981' 
  AND token = 'WiFNFD4kb9RoF6jx9eDD2ClfMTsuBpJrSs/JcNUyIZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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