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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '754bb14365ca8a1f4c8eb37ff36ca8227c4c58ca4fdfbb55593d83fc5ca21855' 
  AND token = 'js5U+de8wJsIksQw5iz6ZbwmebEE4x3fLDIUSQhScB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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