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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c47046517b859d9ccf2ba5088886a360c97913941862d6f43f5fb95b2022195' 
  AND token = 'Jsm1JQxTUf4Mfs7U0CmI07rYPWqgxNKTwMypbUqNQC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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