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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b26a77511edbf4abd42c88acf6a29c143e212963ca5028343f34cd9b1dcd4873' 
  AND token = 'j4KlddZthr+ALXEipyqRNFbzC8em/yWwa2urOWcZQoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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