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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c15cc25f9dfb0f0c0c9c890e432f3d43e5cf1c9bead71e18a45e7a9c9188d1' 
  AND token = 'zdPml0iYVyvhxM8p3Uhy5GbmSHBuE4OQnNdLE2O7Na0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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