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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1e8d753869dd93535cedf0cab4acbb0abedb2a4985f5750d81c387f14ce074' 
  AND token = 'tQ9DjBT695GpOt61dx5fcyybbB5wHFcHO9nR5J3tOt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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