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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3dc55ae5b353f9447026aca20a8c475dd502d93c1b5d4c3af9b72c17e6a9d88' 
  AND token = 'naTHJU79oJ+2ongRwyCntpGdLn47138B5NeJ8fmzcCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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