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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b8d587dce04e411e2e2b48071e8f4f565513462639cc28e66525b7ec8bf0df' 
  AND token = 'Dc+OyNjsuQZa7uLRCTpR2wccg9Nju2OR6dpZ4ROTZhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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