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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf6c51b113cf35127f0c97cc7e92d0f22bcd4283f5d35c867ae1bb76ad09e463' 
  AND token = 'vlVbhm23OYHehknmD1U2xymaGn1zxE0vnmESuzeWD9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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