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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873e5ef9169f4f669fd4b759549713a16b09c9b5c323f409290d9902e6af665d' 
  AND token = 'nMVM9lUIvabVxA25ZoBV5wIsRBjhToI9A1m5kWygM3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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