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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8540047c25be8af8178760f2bca5b0cfb444de504589073e3792a8202cce4d3e' 
  AND token = 'xX86jPjb8c6ZOfigq7+tiZs1V8syTNgjHtxFxTltSjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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