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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '986742473b0ae885fe10c9cc054246cbac2c51e33ee034c718c5c2551b31efb8' 
  AND token = 'Ra6hnmRkQ80/rLvpgru7dys9oeOHhtqQ0Tr1C5me16o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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