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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e6c373f896802e1f17c29eeb3364e541a6c3f69894d87e67fd94d6af8afe807' 
  AND token = '8XG3wrndNQj/f5mAh+ojYRNU7Xo+Uznz5dbThfUHVek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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