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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c7f3e7d9c62185513876ba1004d194598c0217dced38675a59be156c393c24' 
  AND token = '6atI0QcdLUEx4EDLlPzrg4gcTzUU8cyVAtuWHdMtYWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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