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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba4beeab4d6396e3eb736f278c1e9483b4175a2675e76fa3c6117e52c70263f0' 
  AND token = 'n+lk7F9ph/8TLfHoLhEPPhsXmqsB0ED0egVAqskYzSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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