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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa6a1538af7a24be5dc20e0a9b9d35510d3a65bce9501f3bfaba00dd1c6e3311' 
  AND token = 'VabeqCTugy9C0vyebofYpRiErKplOhchRJ1FfLaB2ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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