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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32cde46bdd08f8b34ae7425bd4a4650d80abedc98059e036c8b836f14eb7e8f' 
  AND token = 'MpHgNhCwwGI+9z2ztCCPrT4y7qX4haD8DH8rso7DGJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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