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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96d64e32cea0367d3ff21a6781a71562e5d915f74a5b611552a5d9d41af7741' 
  AND token = 'uZuKGQApaWxYYFpcfRD3gMBMvbU6z4cBoLD8beFaleE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

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