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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df9c0c2bde8d100ce1981a428806b4f4f8ff3c8cb13966f85e630c3296e89a3' 
  AND token = 'mgSSffc5UhwNeRaKK4D0wQqygAsW0cxY839o/e41TBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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