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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d4c40b4fb9498284d6ba8cecd6dca81afeca1ae75dc30b0874a033ee50aab8' 
  AND token = '2doKI5h7lVPwGQeiGBqk6cr41zELbEJEz4tHckj/PYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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