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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd242f7d614db085169651dda142dca54a621a4613056f5e8ccde8296abbb6b' 
  AND token = 'hR09ropWJ8LeXrq1W8MzusofoKF2BCp2/dsTWB6YOeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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