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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee57095f99a9fc80c4d0ce6c88e890b57c2639caaa861d57cc5c5bcce9a57e5c' 
  AND token = 'Vq/M7mBmr3Sel2U/nUFJPnLddFajehXBSb22WH9PDEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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