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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f4bb3e6ffe991b83ad31ab4b4494181d3e5801f04e331a6326da4bc977c8d2' 
  AND token = 'incDW1A0nk8fV8ExwoadgbQNsmCtuklQa+rw6o7ili0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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