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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cf91aea2d1adca9398397d3c00605df28a6c380dc0eebd9fa21f3a0bce13250' 
  AND token = 'YaqLK+izkul+/jB7Idejn/NasOVDAAIDXTsbkbfejKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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