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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b0c5e295eab0712c67cac19d8d74834de751150cd570914f75a1fc80759c33a' 
  AND token = 'L8e6ZHdqZz3GnhP5TpasWqX1t8PMNa1w6r4GsBtjNI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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