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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe317f193522a19e272f55c01a9ae02f7c0d84d42093a536c6e32480d375754' 
  AND token = '0aNk9J2fE4iDauNT+yjJ8z1/ZjY5e9u6KIi+5iNGWpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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