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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c16c1a71f8ac710804b3d511304b7225374f1ea9c185e6d61f98a1dd10425b68' 
  AND token = 'Beuk1x2RpbNND59fHAY4sxGefBortdAuQt/6LFu/vtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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