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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d09a6b07b9a61bc0c7a09180a587a47378d0b3c45b0de2e071683998edd9fb' 
  AND token = 'KJir0J4Tdi5vvEnLPPN3h9N+CSQpO9YBs9AdUeR6E9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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