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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe65217800aa6d5d6ce9b12bf3525e49378f4453974712c45dee8f67e96524a' 
  AND token = 'Hoh2IPESSzoAjzbAq/x/D5jCCXQjT/Ifpwf+9sjl4CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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