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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb24e64c71efc02a181132dc217a41f5f5d64f393d84ac5a9ef4aaa8e415fb65' 
  AND token = 'jiaqYJJiPteKi5QPsIb/fS096ypA6iXdCrbgGKHctq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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