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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5952c80a47d1d679d2f85ba3a5470486732f8053d187c3a5acdff9126e117711' 
  AND token = 'cSDYkb6QFGPnvZEIdEd6S7Z0S06LZlP6zpAMMbp+90M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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