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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '772bbde8fe79387734a3bae9cc5814ef9e7a8f49a247a08b8e8be0026443a771' 
  AND token = 'SThhx/XkyBbqTb6eMIHa8uHQ3R7mSWY4LF125lrJ9AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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