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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7dcacf1c493379203915454ea1e79e0944199e5f8a74ab1fce0c6b94ebff773' 
  AND token = 'PGrB81BbRFwzTUg7/iyiiKPOeVvfGUjF/S7HCswCeTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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