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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c40e480b2e413cf3eb1c4cfee4d89f383ca5ef0ec67ffcc8bf41d03121311b0f' 
  AND token = '0Gj5lJ2bBch+T+/Dq/TTsbozuYCkpU/9Q2xxso8FVMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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